Part-time and casual workers are doing more and more unpaid overtime as full-time employees make use of the right-to-disconnect workplace laws.

New research by the Centre for Future Work at The Australia Institute found the average worker was doing 3.5 hours of unpaid overtime each week, or equivalent to more than four and a half full-time weeks per year.

That averages out to about $8000 lost by each worker, or a collective $95.8 billion loss to the entire workforce.

The Centre found that full-time employees averaged 3.8 hours of unpaid overtime a week, compared to 3.7 hours for part-timers.

"The situation for full time workers has stabilised. It's a good first step. I would say, for them, the right to disconnect is working," Centre for Future Work director Fiona Macdonald said.

"Bu

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